对Java协议进行小的更改缓冲对象 [英] Making a small change to a Java protocol buffers object

问题描述

我想在Java协议缓冲区对象的树中进行一些小改动。

I want to make a small change, deep in tree of Java protocol buffer objects.

我可以使用 .getBuilder（）创建一个新对象的方法，该对象是一个旧对象的克隆，但有一些更改。

I can use the .getBuilder() method to make a new object that is a clone of an old one with some changes.

当这是在深层完成时，代码变得丑陋：

When this is done at a deep level, the code becomes ugly:

Quux.Builder quuxBuilder = foo.getBar().getBaz().getQuux().toBuilder()
Baz.Builder bazBuilder = foo.getBar().getBaz().toBuilder()
Bar.Builder barBuilder = foo.getBar().toBuilder()
Foo.Builder fooBuilder = foo.toBuilder()

quuxBuilder.setNewThing(newThing);
bazBuilder.setQuux(quuxBuilder);
barBuilder.setBaz(bazBuilder);
fooBuilder.setBar(barBuilder);

Foo newFoo = fooBuilder.build();

（这只是4级，我经常处理5-8级。）

(This is just 4 levels, I'm routinely dealing with 5-8 levels.)

有更好的方法吗？

推荐答案

另一种选择是（我认为;已经有一段时间了）：

Another option is (I think; it's been a while):

Foo.Builder fooBuilder = foo.toBuilder();
fooBuilder.getBarBuilder().getBazBuilder().getQuuxBuilder()
    .setNewThing(newThing);
newFoo = fooBuilder.build();

请注意，这不是更有效率;你还在复制foo，bar，baz和quux。

Note that this isn't any more efficient; you're still making copies of foo, bar, baz, and quux.

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